Step-by-step explanation:
11. |-4|×5=
=4×5
=20
12.|140-7|+|38-4|=
=|133|+|34|
=133+34
=167
13.|-12+7|=
=|-5|
=5
14.7+|10+4|=
=7+|14|
=7+14
=21
15.|4+7|-|7-4|=
=|11|-|3|
=11-3
=8
16.-8
17.-3
18.-2
19.9
20.3
